Rope traction device

Abstract

A rope traction device has a sheave which is driven and rotated to cause a traction rope to be wound on the sheave and thereby moves along the traction rope. The rope traction device includes a pair of annular side plates made of an elastic material and provided at sides of the sheave in such a manner that the interval between the inner surfaces of the side plates is made smaller than the diameter of the rope by a predetermined value and the side plates are secured to the sides of the sheave by means of boltheads of bolts arranged alternately in the circumferential direction of the sheave. The side plates may alternately be secured to the sides of the sheave by means of boltheads of bolts and nuts positioned at opposite positions in the circumferential direction of the sheave.

I claim: 
     
       1. A rope traction device having a sheave which is driven and rotated to cause a traction rope to be wound on the sheave and said rope traction device thereby moving along the traction rope, said device being characterized in that said rope traction device comprises a pair of annular side plates made of an elastic material and provided at the side of the sheave in such a manner that the space between the inner surfaces of the side plates is made smaller than the diameter of the rope by a predetermined value and the side plates are secured to the side of the sheave by means of boltheads of bolts positioned alternately on opposite sides of the sheave in the circumferential direction of the sheave to permit the adjacent side plate portion opposite to the boltheads to flex freely outwardly to create a wedging force about a traction rope. 
     
     
       2. A rope traction device as defined in claim 1 wherein said side plates are made of a pair of leaf springs. 
     
     
       3. A rope traction device having a sheave which is driven and rotated to cause a traction rope to be wound on the sheave and said rope traction device thereby moving along the traction rope, said device being characterized in that said rope traction device comprises a pair of annular side plates made of an elastic material and provided at sides of the sheave in such a manner that the space between the inner surfaces of the side plates is made smaller than the diameter of the rope by a predetermined value and the side plates are rigidly secured to the side of the sheave by means of boltheads of bolts positioned on one side plate of the side plates and nuts positioned on opposite sides of the boltheads in the circumferential direction of the sheave to permit side plate portions to flex freely outwardly between the boltheads and the nuts to create a wedging force about a traction rope. 
     
     
       4. A rope traction device as defined in claim 3 wherein said side plates are made of a pair of leaf springs.